On the evolution of oil-separation properties of lubricating greases under shear degradation

The bleed rate of a grease may change over time due to degradation the thickener microstructure and decrease in oil content, as is released from grease. In this work, properties—quantified by permeability—of five types lubricating greases are studied. Controlled shear ageing performed using worker. It shown that does not significantly worker at room temperature, opposed changes rheology microstructure. This explained permeability model. shown, via comparison with rolling bearings results, too mild yield significant greases.